[PATCH 5.17 0180/1126] xtensa: fix stop_machine_cpuslocked call in patch_text

Greg Kroah-Hartman
2022-04-05T07:51:25Z

From: Max Filippov <jcmvbkbc@gmail.com>

commit f406f2d03e07afc199dd8cf501f361dde6be8a69 upstream.

patch_text must invoke patch_text_stop_machine on all online CPUs, but
it calls stop_machine_cpuslocked with NULL cpumask. As a result only one
CPU runs patch_text_stop_machine potentially leaving stale icache
entries on other CPUs. Fix that by calling stop_machine_cpuslocked with
cpu_online_mask as the last argument.

Cc: stable@vger.kernel.org
Fixes: 64711f9a47d4 ("xtensa: implement jump_label support")
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
arch/xtensa/kernel/jump_label.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/xtensa/kernel/jump_label.c
+++ b/arch/xtensa/kernel/jump_label.c
@@ -61,7 +61,7 @@ static void patch_text(unsigned long add
.data = data,
};
stop_machine_cpuslocked(patch_text_stop_machine,
- &patch, NULL);
+ &patch, cpu_online_mask);
} else {
unsigned long flags;